What should we pay attention to when welding stainless steel pipe?
The welding of stainless steel pipes directly affects the quality and service life of stainless steel pipes.What should we pay attention to when welding stainless steel pipe? Here are the main matters need attention.
1.The use of vertical external characteristics of the power supply, DC using positive polarity (welding wire is connected to the negative electrode).
2.It is generally suitable for the welding of thin plates under 6mm, with the characteristics of beautiful weld forming and small welding deformation.
3.Protective gas is argon, with purity of 99.99%.When the welding current is 50~50A, the flow rate of argon is 8~0L/min, and when the current is 50~250A, the flow rate of argon is 2~5L/min.
The welded stainless steel pipes
4.The length of the tungsten electrode protruding from the gas nozzle is 4~5mm. It is 2~3mm in the place of poor shielding, such as fillet welding, and 5~6mm in the place of deep grooving.
5.In order to prevent the appearance of welding pores, welding parts such as rust, oil must be cleaned up.
6.For welding arc length, 2~4mm is the best when welding ordinary steel, and ~3mm is the best when welding stainless steel. If it is too long, the protection effect is bad.
7.In order to prevent the back of the bottom bead from being oxidized, the back side also needs to be protected by gas during butt butt.
8.In order to protect the welding pool well with argon gas and facilitate the welding operation, the Angle between the center line of tungsten electrode and the workpiece at the welding place should generally be maintained at 80~85°, and the Angle between the filler wire and the workpiece surface should be as small as possible, generally about 0°.
9.Windproof and ventilation.In windy areas, always take measures to stop the net, and take appropriate ventilation measures indoors.
As the professional manufacturer of flanges, fittings, pipes and other pipeline products, our HEIBEI HAIHAO GROUP can produce and supply various types stainless steel pipes with high quality. Our customers are widely distributed all over the world. If you have any need, welcome to contact us.Email:sales@haihaogroup.com